裸露耕地土壤风蚀物化学组分的分布特征

Distribution characteristics of soil wind erosion sediment chemical composition of naked farmland

为研究风蚀引起的土壤营养物质的流失,进一步理清土壤沙化的原因及机理,该文以内蒙古阴山北部的典型农牧交错带耕地为试验区,采用SCC-6型集沙仪收集跃移土壤风蚀物,对收集到的土壤风蚀物进行筛分、称质量,并对表层土壤及收集的土壤风蚀物采用化学滴定及火焰原子吸收分光光度法对土壤营养物质中的主要成分及部分金属元素组成进行测定。通过分析整理,得出了风蚀物各化学组分含量、各化学组分总质量在地面垂直高度的分布规律,以及土壤各化学组分含量、土壤粒径大小与风蚀程度的相关关系;通过化学组分含量的分布规律分析进一步验证了风蚀是使细小颗粒的损失,造成土壤贫瘠的主要因素。

In order to study the loss of soil nutrients caused by wind erosion and the reason and mechanism of soil desertification,taking the typical agro-pastoral ecotone bare tillage land of northern foot of Yinshan Mountain in Inner Mongolia as the study area,saltation soil sediment was collected by SCC-6 sediment collector to conduct screening and weighing.In the soil and collected soil sediment,the main nutrient contents and part of metal elements were determined with chemistry titration and flame atomic absorption spectrophotometer.Through analysis,the distribution of sediments chemical component content and total mass of each chemical composition along vertical height of the soil and the relevant relationships of wind erosion extent with soil chemical composition and particle size were obtained.Through regularity analysis of distribution of chemical components,wind erosion was further validated as the main reason of siol fine particles loss,which is the main factor on causing poor soil.